The energy that supercharged Hurricane Milton into a Category 5 storm on Monday came from the waters of the Gulf of Mexico, which have been abnormally warm not just at the surface, but at depth, too.

Ocean temperatures set a record high in 2025, according to a new study. The authors found that the heat content of the ocean increased by about 23 zettajoules between 2024 and 2025. That’s roughly the ...

(CNN) — Elkhorn and staghorn corals used to carpet Florida’s reef system, rising like antlers from the seabed — but not anymore. These crucial coral species are now “functionally extinct” in the ...

Australia’s ocean temperatures reached a record high in 2025, with sea surface temperatures warming close to 1°C above the long-term average. The mean annual sea surface temperature in the Australian ...